Josh Brolin shares a star-studded video of the Avengers singing Happy Birthday ...

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He had to keep mum on some great behind the scenes footage from Avengers: Endgame.

Josh Brolin, 51, broke his spoilers embargo on Friday when he shared a video of most of the Avengers cast wishing him a happy 50th birthday.

The assembled forces sang Happy Birthday while in costume and fully made-up for the movie's climactic battle sequence.

The whole gang: Josh Brolin, 51, broke his Avengers: Endgame spoilers embargo on Friday when he shared a video of most of the Avengers cast wishing him a happy 50th birthday

The whole gang: Josh Brolin, 51, broke his Avengers: Endgame spoilers embargo on Friday when he shared a video of most of the Avengers cast wishing him a happy 50th birthday

'I was never able to post this before, for obvious reasons. But behind all the hate, all the misunderstandings, all the bruises, bumps, and ashes, there was this on my 50th birthday,' he captioned the video.

'So deep deep down, even from these guys and gals, everyone has a little purple love in them. #teamthanos. Love my wife,' he added, also tagging his wife, Kathryn Boyd, as well as Robert Downey Jr., Disney, Marvel Studios, and the directing team of Joe and Anthony Russo. 

The short video picks up in the middle of the action, as most of the Avengers: Endgame cast was assembled in a dirt pit created in a studio with a green screen visible in the background. 

Feeling the love: 'I was never able to post this before, for obvious reasons. But behind all the hate, all the misunderstandings, all the bruises, bumps, and ashes, there was this on my 50th birthday,' he captioned the video; pictured April 22

Feeling the love: 'I was never able to post this before, for obvious reasons. But behind all the hate, all the misunderstandings, all the bruises, bumps, and ashes, there was this on my 50th birthday,' he captioned the video; pictured April 22

Best buds: 'So deep deep down, even from these guys and gals, everyone has a little purple love in them. #teamthanos'

Best buds: 'So deep deep down, even from these guys and gals, everyone has a little purple love in them. #teamthanos'

Though a couple cast members in the back stayed relatively reserved and stone-faced, like Sean Gunn, who appears in the Guardians Of The Galaxy films and plays Rocket Raccoon on set, others took the sweet opportunity to ham it up.

Robert Downey Jr. (Iron Man) gesticulated wildly with his arms to punch up the drama, while Chris Hemsworth (Thor) and Chris Pratt (Star Lord) put on a dance for the No Country For Old Men star.

The video wasn't just a sweet memory from filming the superhero epic, which was shot back to back with last year's Avengers: Infinity War,

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